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What is current?

A short guide to currents in circuits. It answers what is current and how do we measure it.

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RMS Current

Circuit currents and voltages in AC circuits are generally stated as root-mean-square or rms values rather than by quoting the maximum values. The root-mean-square for a current is calculated by ...

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Visible Current

A demonstration of electric currents in a DC circuit

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Magnetic Field

Magnetic fields are produced by electric currents, which can be macroscopic currents in wires, or microscopic currents associated with electrons in atomic orbits. The magnetic field B is defined in ...

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Electrical symbols, circuits and safety - posters

A useful collection of posters from the Institute of Electrical Engineers that cover the electrical symbols and other circuit information.

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Resistance at the molecular level

A useful animation to demonstrate the free electron model of current flow, showing electrical resistance in the copper wire of a lightbulb.

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Induction and inductance

Introductory level page on electromagnetic induction - the process of generating electrical current in a conductor by placing the conductor in a changing magnetic field.

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Motor

Electric motors involve rotating coils of wire which are driven by the magnetic force exerted by a magnetic field on an electric current. They transform electrical energy into mechanical energy.

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Electrical resistance

A good explanation of electrical resistance, why it exists and the variables that affect it including wire length, width and material.

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Current Law

The electric current in amperes which flows into any junction in an electric circuit is equal to the current which flows out. This can be seen to be just a statement of conservation of charge.

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